摘要
目的检测纳米金刚石填料改性的自行合成的核树脂与牙本质的微拉伸粘结强度。方法选择10颗因阻生拔除的健康第三磨牙,磨除面釉质,形成牙本质平面。随机分成2组,每组5颗牙齿。采用自行合成的纳米金刚石填料改性的核树脂(UFD-C)和Luxa-Core(L-C)商品核树脂充填并分别粘结于牙本质面上,形成4mm～5mm高的树脂层。将牙齿及上方的粘结树脂样本平行于牙长轴片切成约0.9mm×0.9mm的柱状试件,每组共30个试件。用微拉伸测试仪检测其粘结强度,体视显微镜观察其断裂类型,用扫描电镜观察样本粘结界面和断面的超微形态。结果UFD-C组与牙本质的微拉伸粘结强度均值为:(36.03±9.25)MPa,L-C组与牙本质的微拉伸粘结强度均值为:(36.80±10.56)MPa,两组的粘结强度差异无显著性。UFD-C组70%为粘结面断裂,L-C组80%为粘结面断裂。扫描电镜显示两种核树脂的粘结界面均有树脂突形成。结论自行合成的纳米金刚石改性核树脂(UFD-C)与Luxa-Core核树脂(L-C)的微拉伸粘结强度差异无显著性,能达到牙体缺损粘结修复的要求。
Objective To evaluate the mierotensile bond strength of two types core build - up composite（ Ultrafine Diamond Core, UFD - C, Luxa Core, L - C ） to the dentin in vitro. Methods A total of ten freshly extracted human mandibular third molars were used. The enamel of occlusal surfaces of the teeth was removed by Isomet Low Speed Saw and superficial dentine was exposed. The teeth were randomly divided into two groups： and a crown of two types core build - up composite（ UFD -C and L- C） bonded with the adhesives according to the manufactureers＇instructlons. The bonded teeth were sectioned into 0.9mm×0.9mm sticks. Thirty specimens per group were obtained and then were measured with the microtensile bond tester. Each failed specimen was observed with optical microscope, SEM was used to observe the micromorphology of the bonding unit. Results The average microtensile bond strength of UFD - C was （36.03 ~ 9.25 ） MPa （36.80 ~ 10.56 ） MPa for group L - C, there were no significantly difference between the average microtensile bond strength of the wo groups （ P 〉 0.05 ）. There is 70% adhesive failure in the UFD - C group and 80% in the L - C group and resin tags in the hybrid layer were examination under SEM. Conclusion There is no significantly difference between the microtensile bond strength of the UFD - C group and L - C group The UFD - C is suitable for restoration of defected teeth.
出处
《现代口腔医学杂志》
CAS
CSCD
北大核心
2008年第1期29-32,共4页
Journal of Modern Stomatology
关键词
纳米金刚石
核树脂
牙本质
微拉伸粘结强度
Ultrafine diamond Core build- up composite Dentin Microtensile bond strength
